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  <h1 class="title">简介</h1>
  <p class="para">
   Libevent is a library that provides a mechanism to execute a callback 
   function when a specific event occurs on a file descriptor or after a 
   timeout has been reached.
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   More information about Libevent can be found at <a href="http://www.monkey.org/~provos/libevent/" class="link external">&raquo;&nbsp;http://www.monkey.org/~provos/libevent/</a>.
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